Renewable fuse



W. A. BRUNE LLE. RENEWABLE FUSE. APPLICATION mm mc. 22. 1919.

Patented May 2, 1922 INVENTEIR I JABRUNELL E EYKLFRI M N T D T-An s WILFBID A. BRUNELLE, or sourn' HADLEY FALLS, MASSACHUSETTS.

RENEYVABLE FUSE.

Specification of Letters Patent.

Patented Ma 2,1922.

Application filed. January 22, 1919. Serial No. 272,530.

To all whom it may concern:

Be it known that I, W nners A. BRUNELLE, a citizen of the United States of America, and resident of South Hadley Falls, in the county of Hampshire and State of Massachusetts, have invented certain new and use ful Improvements in Renewable F uses. of which the following is a full, clear, and exact description.

This invention relates to improvements in renewable fuses'and one of its leading objects is to provide a plug fuse with means for detaching the fragments of the fuse wire and replacing a fresh fuse wire or fuse strip, so that the body of the plug or the holder of the wire can be repeatedly used.

Another object of the invention is to provide a renewable fuse with a partition of insulated material between the terminals of the fuse wire so that direct arcing between the terminals will be .avoided'when the fuse wire has been broken by an overload.

Another object of the invention is to improve the assemblage of the holder, whereby the old fuse wire parts may be removed and the new fuse wire replaced.

With the above and other objects in view the invention consists in certain new and useful constructions, combinations and arrangements of parts, clearly described in the accompanying specification and fully illus trated in the accompanying drawings, in which:

Fig. 1 is a side elevation with the cap shown in vertical section.

Fig. 2 is a plan view.

- Fig. is a plan view of the base. with the cap removed.

Fig. 4 is a vertical sectional view with the cap removed, the upper part of the device being shown in elevation.

Fig. 5 is a plan view of the modified form.

Referring to the accompanying drawings illustrating my invention 5 designates the base of the fuse wire holder, which is formed of porcelain or other insulating material. The screw threaded shell 6 is positively connected with the base 5 by any suitable method of manufacturing. A contact element 7 is secured to the nose of the base and a conductor wire 8 is embedded in said base and connected to said contact element 7 at one end while its opposite end 8' is disposed to one side of the center of the holder or base and screw threaded.

On the conductor wire 8 the washer 9 or look nut is threaded tightly against the top of the base and a nut 10 is threaded on said conductor wire to clamp one end of the fuse strip or wire thereto. One end of the fuse wire 11 is connected to said conductor wlre 8 and the other end is connected with a conductor wire 12 by means of a nut 14 which is threaded onthe upper end 12 of the wire 12 against the lock nut 13 by means of the nut 14.

In order to prevent arcing between the terminals 8 and 12 provision is made in the form of upstanding partitions 15 and 16 which are spaced from each other to provide a gap 17 therebetween. The partitions 15. and 16 are formed integral with the base 5 and are therefore, composed of insulating material. The'fuse strip or wire 11 is arranged zig zag around the ends of the partitions 15 as indicated in Fig. 2 and in order that the wire may be retained closely against the top of the base 5 each of said partitions is formed with a notch 18 at its end. In order that the length of the wire used for electrically connecting the terminals 8 and 12 may be varied the partition 15 is formed with a notch '15 located near the terminalnotch 18 thereof. The partition 16 is formed with a similar notch 16 located near the terminal notch 18 thereof. By disposing the fuse wire in the notches 15' and 16 a shorter fuse wire or strip may be employed to establish electrical contact between the terminals 8* and 12 The top of the base is covered by means of a mica disc 19 which is retained in place by means ofthe annular flange 20 of the cap 21. The wall of the cap 21 is formed with indentations 21' which are adapted to resiliently engage the recesses 22 formed in the upper portion of the base 5. The upper por tion of the base 5 is formed with an external shoulder 5 which is provided with recesses 23* disposed oppositely to each other. A retaining member 23 is disposed across the top of the cap 21 and is provided with terminal portions 23* which look into the recesses 23 The locking member 23 is secured in place by means of small screws 24 which are threaded into oflfset portions 20 of the annular flange 20. In this way the cap 21 is prevented from turning on the base 5 when the plug is threaded into the socket or unthreaded from the socket.

the wires 27 and 27 and the fuse wire may be connected with the terminals 27 and 2'? hr being wound alternately through the notches 25' and 25 or b bein extended throu 'h b ust one of said notches. lne base w is also formed with integral upstanding lugs E29 and 29 which are provided with metal inserts formed with screw threaded openings 30,

whereby the annular flange 20 may be secured directly thereto by means of suitable screws threaded to said lugs 25) and 29. Said lugs will also support said flange against inward movement. The body 5* is formed with recesses 28 and 28 located in opposite sides thereof to receive the retaining member 23.

It will be seen from the foregoing descrip tion that I have devised a renewable fuse construction wherein the holder may be re peatedly used after the fuse wire has been burned, and no particular skill is required in removing the fragments of the old fuse wire and inserting a new fuse wire.

Having described my invention I claim A renewable t'use cons sting ot a body of insulating material having a metallic shell formed with screw threads, a wire extending through the center of the inner end of said body and providing a terminal contact at said inner end, the other end of the wire being extended outwardly of the outer end of said body, a wire having metallic contact with said shell and extended outwardly of the outer end of said body, means for securing the terminals oi. a fuse wire to said wires. a partition of insulating material located between said terminals, the head of said body being formed with recesses in its sides, a cap having an annular flange adapted to overlie said head and having a wall provided with indentations adapted to loekingly engage the reccssesysaid head also being formed with notches a member disposed across said cap and provided with terminal portions to engage the notches, and means for holding said member locked to said cap.

Fzi 'ned by me at Holyoke Mass. in pres ence oi. a subscribing witness.

WILFRID A. BRUN ELLE.

Witness ALEX A. ELLIS. 

